121537057 has 4 divisors (see below), whose sum is σ = 125728020. Its totient is φ = 117346096.

The previous prime is 121537051. The next prime is 121537067. The reversal of 121537057 is 750735121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750735121 = 101 ⋅7433021.

It can be written as a sum of positive squares in 2 ways, for example, as 19749136 + 101787921 = 4444^2 + 10089^2 .

It is a cyclic number.

It is not a de Polignac number, because 121537057 - 2¹¹ = 121535009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121537051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2095438 + ... + 2095495.

It is an arithmetic number, because the mean of its divisors is an integer number (31432005).

Almost surely, 2^121537057 is an apocalyptic number.

It is an amenable number.

121537057 is a deficient number, since it is larger than the sum of its proper divisors (4190963).

121537057 is an equidigital number, since it uses as much as digits as its factorization.

121537057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190962.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 121537057 is about 11024.3846540294. The cubic root of 121537057 is about 495.3394359270.

The spelling of 121537057 in words is "one hundred twenty-one million, five hundred thirty-seven thousand, fifty-seven".